Where is the source of Weihe River?

Originated in Bird and Rat Mountain in Weiyuan County, Dingxi City, Gansu Province, it mainly flows through Tianshui in Gansu Province, Baoji, xianyang, Xi and Weinan in Guanzhong Plain of Shaanxi Province, and joins the Yellow River in Tongguan County, Weinan City.

There is an east-west Qinling Mountains on both sides of the Weihe River, and a Liupanshan barrier in the north. Weihe river basin can be divided into loess hilly and gully region in the west and Guanzhong plain region in the east.

The average annual runoff of Weihe River is 7.57 billion cubic meters, and that of Shaanxi is 5.38 billion cubic meters. The distribution of runoff area is uneven, and the general trend is decreasing from south to north, which is higher in Qinling and Guanshan areas and lower in the original and valley areas. The west is bigger than the east, and the middle reaches are richer than the downstream.

Extended data:

Hydrological characteristics of Weihe River;

1, runoff change

The annual variation of runoff in the middle and lower reaches of Weihe River is smaller in the south than in the north, that is, the annual runoff in Qinling Mountain on the south bank of Weihe River is rich and the annual variation is small; The annual runoff in the loess area on the north bank is small and the interannual variation is great. The coefficient of variation of annual runoff on the northern slope of Qinling Mountains is generally 0.30 ~ 0.40, of which Shitou River and Qingjiang River are only 0.30, Heihe River, Laohe River and Fenghe River are 0.40, and then Dayu River and Shibianyu River to the east drop to 0.35.

Step 2: precipitate

Weihe hua county Station transports 492 million tons of sediment to the Yellow River every year. Sediment mainly comes from the loess area on the north bank, especially the upper reaches of Jinghe River and Weihe River. Jinghe River transports 309 million tons of sediment to Weihe River every year (Zhangjiashan Station), accounting for 62.8% of the total sediment transport at hua county Station, while the basin area only accounts for 40.6% of hua county Station. The sediment from the upper reaches of Weihe River is 200 million tons per year at Linjiacun Station, accounting for 40.6% of the annual sediment discharge at hua county Station, while the basin area only accounts for 28.8% of that at hua county Station.

Step 3 flood

The rainfall in the middle and lower reaches of Weihe River is concentrated in July, August and September, with more storms and floods. According to the measured data, the maximum flood of Weihe River is at 1954, the maximum flood peak discharge of Linjiacun Hydrological Station is 5030m3/s (1954 August 17) and the maximum flood peak discharge of Xianyang Station is 7220m3/s (1954 August/kloc).

Baidu encyclopedia-Weihe River